*3.2.3. Intersite comparisons*

The relative concentrations of contaminants observed in all sites exhibited a general common pattern, ∑DDT > ∑Chlordane > ∑PCBs >*β*-HCH> dieldrin > mirex, which was dominated by ∑DDTs, followed by chlordanes and PCBs, and secondly by *β*-HCH, dieldrin and mirex. Concentrations of ∑PCBs and OC pesticides detected in Galapagos sea lion pups showed no significant differences among rookeries (ANOVA for all comparisons, *p*> 0.05). This might suggest a common, global source of contamination delivering POPs to the animals, and that localized sources play a little role in contributions of POPs.

Assessing Biomagnification and Trophic Transport of Persistent Organic Pollutants in the Food Chain of the Galapagos Sea Lion (*Zalophus wollebaeki*): Conservation and Management Implications 93

> **BMF***TL***se a lion/ thread herring**

6.35 10.0 80.0 177 74.0 1610 57.5 2.70 x 1020

**BMF***TL* **sea lion/ mullet**

**BMF***TL* **\* sea lion/ thread herring** 

**BMF***TL* **\* sea lion/ mullet** 

**BMF sea lion/ mullet**

**p,p'-DDE** 6.93 9.44 150 220 140 2000 100 2.10 x 1021 **p,p'-DDT** 6.39 10.7 150 84.0 140 760 106 3.00 x 1017 **p,p'-DDD** 6.30 10.3 41.0 33.0 38.0 300 31.0 6.60 x 1013 **∑DDT** 6.41 10.7 132 180 122 1630 92.0 3.10 x 1020 *β***-HCH** 3.81 10.5 68.5 60.7 60.0 550 50.0 1.60 x 1016

**chlordane** 6.27 10.1 7.90 14.0 7.00 130 6.80 2.67 x 1010 *cis***-chlordane** 6.20 10.1 35.0 65.0 33.0 590 27.0 2.86 x 1016

*cis***-nonachlor** 6.08 8.38 44.0 68.0 40.0 615 33.0 4.30 x 1016 **∑Chlordanes** 58.0 113 54.0 1030 43.0 4.70 x 1018 **Mirex** 7.50 7.96 22.0 176 21.0 1600 18.0 2.50 x 1020 **Dieldrin** 5.48 8.73 45.0 30.0 41.0 270 34.0 2.70 x 1013 **PCB-52** 5.90 8.39 12.5 1.21 12.0 11.0 10.0 5.80 x 100 **PCB 74** 7.70 8.41 32.0 7.87 30.0 72.0 25.0 1.40 x 108 **PCB 95** 7.30 8.98 8.78 1.25 8.10 11.0 7.50 7.50 x 100 **PCB-99** 6.60 9.36 16.7 3.64 15.5 33.1 13.5 1.30 x 105 **PCB-101** 6.30 9.11 10.3 1.90 9.53 18.0 8.66 4.20 x 102 **PCB-105** 6.80 9.56 8.10 2.20 7.50 20.0 6.95 1.28 x 103 **PCB-118** 6.70 8.24 12.0 3.17 11.0 29.0 10.0 3.60 x 104 **PCB 128** 7.00 9.16 11.4 3.60 10.5 33.0 9.50 1.10 x 105

**138/163/164** 7.20 10.0 15.0 5.90 14.0 54.0 12.0 1.10 x 107 **PCB-146** 7.30 9.22 11.8 7.33 11.0 67.0 9.80 7.30 x 107 **PCB 153** 6.90 9.79 19.0 7.90 18.0 72.0 15.0 1.50 x 108 **PCB 156** 7.40 9.74 2.95 1.28 2.70 12.0 2.72 9.15 x 100 **PCB 174** 7.00 9.62 6.05 1.50 5.60 14.0 5.30 3.90 x 101 **PCB 180** 7.20 9.83 8.30 7.40 7.70 67.0 7.10 7.60 x 107 **PCB 183** 7.00 9.88 8.50 4.10 7.90 38.0 7.30 4.00 x 105 **PCB 187** 7.25 9.71 3.95 2.60 3.70 24.0 3.60 6.90 x 103 **PCB 201** 7.10 10.3 6.26 2.35 5.80 21.0 5.50 2.40 x 103 **PCB 202** 7.10 NR 3.80 2.10 3.55 19.0 3.50 9.40 x 102 **∑PCBs** 12.0 4.10 11.0 37.0 10.0 3.65 x 105

**Table 2.** Biomagnification factors (BMF), Predator-prey Biomagnification factors (BMF*TL*) and Log Predator-prey Biomagnification factors (BMF*TL*\*) in units of kg/kg lipid for organochlorine pesticides (OCP) and PCB congeners in the Galapagos sea lion. The logarithmic values of the octanol-water (KOW) and octanol-air (KOA) partition coefficients for each contaminant are also reported as supporting

Values for log KOW and log KOA were obtained from Kelly *et al.* [2] and Mackay *et al*. [56].

**Compound** 

*trans***-**

*trans***nonachlor**

**PCB -**

NR= non reported;

indicators of bioaccumulation.

**Log KOw 25-26 ºC**

**Log KOA 37 ºC**

**BMF sea lion/ thread herring**
